Question

A closed thin walled tube has thickness, t, mean enclosed area within the boundary of the centreline of tube's thickness, $A_m$, and shear stress $\tau$. Torsional moment of resistance, T of the section would be

• A. $2\tau A_{m}t$
• B. $\tau A_{m}t$
• C. $0.5\tau A_{m}t$
• D. $4\tau A_{m}t$

Answer 1

The correct option is A $2\tau A_{m}t$

$\tau t=\frac{T}{2A_m}$
$\Rightarrow T=2A_m\tau t$